can you give yourself a b12 injection Shot: Step-by-Step Guide for Self-Injection How To Give Yourself A
Description
Hydroxocobalamin is preferred because it binds more tightly to serum proteins, creating a depot effect that allows slower release and longer duration of action

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Its human safety profile is not established there is no completed human trial

Genomics 85:591599

Fortunately, you cannot overdose on vitamin B12, as it is water-soluble, so adding more is not harmful

theoretical risks include increased hypoglycaemia, unpredictable cardiovascular effects, and compounded uncertainty from two incompletely characterised compounds